At the beginning of the battle, Mecha Ridley’s first attack will be with its right claw. Stay at the far left side of the room and dodge the claw attacks by jumping into the air. When the robot extends its neck upward, repeatedly hop into the air and fire Missiles and Super Missiles at the glowing region on its chest until the casing and core is destroyed. When the robot’s right arm is completely lowered, it will be much easier to hit.
Mecha Ridley will also attack by spitting a barrage of fireballs, shooting laser beams out of its eyes, and firing three missiles from a launcher on its back. The missiles can be easily destroyed with the Screw Attack and can be used to restock health and ammo. The diagonally aimed fireballs can be avoided by somersaulting at a medium height, but the laser beams are more difficult to avoid. Mecha Ridley’s eyes will momentarily flash before firing, so use that as an indicator of when to jump.